package com.example.ruiji.service.impl;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.core.toolkit.IdWorker;
import com.example.ruiji.common.Result;
import com.example.ruiji.entity.*;
import com.example.ruiji.mapper.*;
import com.example.ruiji.service.OrderService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import javax.servlet.http.HttpSession;
import java.math.BigDecimal;
import java.time.LocalDateTime;
import java.util.List;
import java.util.Objects;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.stream.Collectors;

@Service
public class OrderServiceImpl implements OrderService {

    @Autowired
    HttpSession httpSession;

    @Autowired
    ShoppingCartMapper shoppingCartMapper;

    @Autowired
    UserMapper userMapper;

    @Autowired
    OrderMapper orderMapper;

    @Autowired
    OrderDetailMapper orderDetailMapper;

    @Autowired
    AddressBookMapper addressBookMapper;

    @Transactional
    @Override
    public Result<String> submit(Orders orders) {
        Long userId = (Long) httpSession.getAttribute("userId");
        LambdaQueryWrapper<ShoppingCart> shoppingCartLambdaQueryWrapper = new LambdaQueryWrapper<>();
        shoppingCartLambdaQueryWrapper.eq(ShoppingCart::getUserId, userId);
        List<ShoppingCart> shoppingCarts = shoppingCartMapper.selectList(shoppingCartLambdaQueryWrapper);
         if (Objects.isNull(shoppingCarts) || shoppingCarts.isEmpty()) {
            return Result.error("购物车为空");
        }
        User user = userMapper.selectById(userId);
        AddressBook addressBook = addressBookMapper.selectById(orders.getAddressBookId());
        if (Objects.isNull(addressBook)) {
            return Result.error("用户地址不存在");
        }
        long orderId = IdWorker.getId();//订单号

        AtomicInteger amount = new AtomicInteger(0);

        List<OrderDetail> orderDetails = shoppingCarts.stream().map((item) -> {
            OrderDetail orderDetail = new OrderDetail();
            orderDetail.setOrderId(orderId);
            orderDetail.setNumber(item.getNumber());
            orderDetail.setDishFlavor(item.getDishFlavor());
            orderDetail.setDishId(item.getDishId());
            orderDetail.setSetmealId(item.getSetmealId());
            orderDetail.setName(item.getName());
            orderDetail.setImage(item.getImage());
            orderDetail.setAmount(item.getAmount());
            amount.addAndGet(item.getAmount().multiply(new BigDecimal(item.getNumber())).intValue());
            return orderDetail;
        }).collect(Collectors.toList());

        orders.setId(orderId);
        orders.setOrderTime(LocalDateTime.now());
        orders.setCheckoutTime(LocalDateTime.now());
        orders.setStatus(2);
        orders.setAmount(new BigDecimal(amount.get()));//总金额
        orders.setUserId(userId);
        orders.setNumber(String.valueOf(orderId));
        orders.setUserName(user.getName());
        orders.setConsignee(addressBook.getConsignee());
        orders.setPhone(addressBook.getPhone());
        orders.setAddress((addressBook.getProvinceName() == null ? "" : addressBook.getProvinceName())
                + (addressBook.getCityName() == null ? "" : addressBook.getCityName())
                + (addressBook.getDistrictName() == null ? "" : addressBook.getDistrictName())
                + (addressBook.getDetail() == null ? "" : addressBook.getDetail()));
        //向订单表插入数据，一条数据
        orderMapper.insert(orders);
        //向订单明细表插入数据，多条数据
        orderDetails.forEach(orderDetail -> {
            orderDetailMapper.insert(orderDetail);
        });
        //清空购物车数据
        shoppingCartMapper.delete(shoppingCartLambdaQueryWrapper);
        return null;
    }
}
